Re: Color at a location on the screen

[Matt Denton]

Hi Klaus

Thanks for the tip, I thought of doing something like this but the ol' mouse would be jumping around all over the place.

I worked out a compromise: because I knew the object I wanted to get the colors from, I grabbed the imageData and worked out the RGB value from the raw data:

on setPixelColor pThisPixelH
put (pThisPixelH - left of image "Rainbow.png"+1)*4 into tLeftOffset -- four bytes per pixel
put charToNum(char tLeftOffset +2 of tColors) into tRed -- 2nd byte is the lovely red dot
put charToNum(char tLeftOffset +3 of tColors) into tGreen -- 3rd byte is the happy green spot
put charToNum(char tLeftOffset +4 of tColors) into tBlue -- 4th byte is the calm blue dot
set the backColor of the target to tRed,tGreen,tBlue
end setPixelColor

I'm sure I could optimize this somehow (seems odd converting charToNum for data that is then converted back again) but it works. Anyway all the info is in the manual under imageData ;-) I just fiddled with it for a bit till it worked for me.

Thanks again Klaus.

I seem to recall an external or was I thinking of another script
language?

Cobol? ;-)

hehe... not in a million years ;-0 I'm a Xtalk dummy (bit of assembly and even raw hex in machine code back in the dark ages...twas tedious but fun).

Chow,

M@
Matt

check the "screenmouseloc

" entry in the index.

You could store the old mouseloc, set the screenmouseloc to the desired
point inside your clear circle, get the mousecolor and set the mouseloc
to its old loc again...

Just a thougth, but should be doable...

Hope that helps.

Does anyone know how to find the color at a location on the screen?

I've got a small clear circle that drags constrained horizontally over
a color bar to select a color. The mouseColor works perfectly as long
as the cursor is over the color, but as the clear circle is
constrained to the color bar, the cursor can really be anywhere.  So I
need to find the color at a location, ie where the circle is on the
color bar.  I've searched under 'screen', 'loc', 'cursor', 'color' and
every other combination I can think of.

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